Micro doses of fertilizer. How? By using a Coca Cola cap as a measure. This is how much fertilizer farmers in Nigeria are using.

That comes to about 4 kilograms of P to a hectare. In Europe and North America, farmers usually apply 3 to 6 times that amount. This technique uses only about one-tenth of the amount typically used on wheat, and one-twentieth of the amount used on corn in the USA.